This incidence rate is the pooled rate based on the incidence of PCP at different CD4 strata in two cohorts reported by Yazdanpanah et al. (3.1 cases/100 PY, 95% CI 2.0, 4.6 for individuals with CD4 count 101–200 cells/μL, 6.7 cases/100 PY (95% CI 3.7, 11.7) for individuals with CD4 51–100 cells/μL and 11.4 cases/100 PY for individuals with CD4 count 0–50 cells/μL (95% CI 7.5, 17.3) [13]. Here, CD4 is linked to pneumocystosis.